Automatic weighing-machine.



W. E. NICKERSON.

AUTOMATIC WEIGHING MACHINE,

APPLICATION FILED T11R24, 1903.

930,489. Patented Aug. 10,1909.

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AUTOMATIC WEIGHING MAGHINB. APPLICATION I'ILED FEB; 24, 1903.

930,489. Patented Aug. 10,1909.

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W. E. NIGKERSON. AUTOMATIC WEIGHING MACHINE.

APPLICATION FILED FEB. 24, 1903.

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W. E. NIGKERSON.

AUTOMATIC WEIGHING MACHINE.

APPLICATION FILED FEB. 24, 1903.

930,489. Patented Aug. 10, 1909.

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W. E. NIGKERSONF AUTOMATIC WEIGHING MACHINE.

APILIGATION FILED FEB. 24, 1903.

Patented Aug. 10, 1909.

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UNITED STATES PATENT OFFICE.

WILLIAM E. NICKERSON, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO AUTOMATICWEIGH- ING MACHINE COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEWYORK.

AUTOMATIC WEIG-I-IING-IdACHINE Specification of Letters Patent.

Patented Aug. 10, 1909.

Application filed February 24, 1903. Serial No. 144,609.

To all whom it may concern:

Be it known that I, VVILLIAM E. NIGKER- soN, a citizen of the UnitedStates, and resident of Cambridge, in the county of Middlesex andCommonwealth of Massachusetts, have invented new and useful Improvementsin Automatic IVeighing-Machines, of which the following is aspecification.

My invention relates to automatic weighing apparatus of that type inwhich the parts are operated by power derlved from the weight of thematerial weighed, and is intended more particularly to provide a simpleand efficient apparatus which will be specially adapted to the weighingautomatically of light, bulky substances such as bran, cotton seed hullsand the like. Considerable difiiculty has heretofore been eX- periencedin automatically weighing such substances with rapidity and accuracy,mainly because of their tendency to clog and stick rather than to flowfreely, in connection with the fact that large openings have to beprovided for the delivery of such material to and from the weighingreceptacle if rapid operation is to be secured, which openings it isdifiicult to close or control with sufficient quickness when the scalebeam poises.

My invention provides an apparatus by means of which the aboveobjections are largely overcome, as will hereinafter appear, although itis also well adapted forweighing many other substances.

Briefly described, my apparatus comprises a weighing beam and scale panor other weighing receptacle, carried thereby, a cutoff also carried bythe scale beam so as to move in unison with the weighing receptacle, andconnections between said receptacle and cut-off whereby the dumping ofthe former operates the latter to prevent the delivery of material tosaid receptacle until it ready to receive another load. I am therebyenabled to control the entire action of the apparatus by means of asingle latch, as will presently appear, and also to feed the inaterialto the apparatus in a continuous stream and thus to dispense with allvariable delivery openings and valves for controlling the same.

My invention also includes certain structural arrangement. and detailshereinafter described.

An automatic weighing machine embodying the preferred form of myimprovements is illustrated in the accompanying drawings, in which:

Figure 1 is a front elevation of the complete machine, which is shown asbroken between its ends for the purpose of indicating that the machinemay have any convenient width. Figs. 2 and 3 are end elevations of themachine as viewed from the right-hand end of Fig. 1, showing the partsin the load-receiving and load-discharging positions respectively. Figs.4 and 5 are vertical sections taken respectively on the lines A-A and BBin Fig. 1, and looking in each case toward the adjacent end of themachine. Fig. 6 is a detail vertical section showing my preferred formof bearing for supporting the cutoff. Fig. 7 is a verticalsectionillustrating a latch hereinafter described, and adjacent parts.Fig. 8 is a transverse section taken on the line CC in Fig. 7. Fig. 9 isa detail vertical section illustrating a form of scale beam suspensionhereinafter described, and Fig. 10 is a section on the line DD in Fig.9.

The working parts of my apparatus are shown in the drawings as supportedby vertical standards 22, located one at each end of the machine, andconnected and braced by suitable tie rods 3. Near the bottom of theframe-work is located a scale beam, which is preferably composed of endpieces 4-4 carried respectively bytheadjacent supports 2 and connectedat their rear ends by a cross rod 5, which may serve as the weighingweight. This rod 5 is shown as provided with a pin 6 on which smalladjusting weights 7 may be detachably carried. On the opposite or frontend of each of the beam ends 4t is pivotally mounted an upright 8, saiduprights being connected by suitable cross rods 8 The frame thus formedis kept vertical and enabled to move freely with the scale beam by meanssuch as links 9 9 pivoted at one end to studs carried by said uprightsrespectively and at the other end to studscarried by the supports 2.These uprights 8S carry the receptacle in which. the material isreceived and weighed, said; receptacle being herein represented as adumping pan 10 of a well-known scoop shape, as such a receptacle ispreferable to one having adischarge door orcloser when materials of thekind above referred to are to be handled. The pan 10 is pivotallysupported at its ends by the uprights 8 or parts connected therewith,such as laterally extending ears 11, and the axis on which said panturns is so located that when a full load of material has been deliveredto the pan, the center of gravity of the upright pan and load will lieto one side of said axis, with the result that the pan willautomatically tip and dump said load if permitted so to do.

Above the pan 10 is located a stream-controller or cut-off 12 which isalso carried by the uprights 8, being shown as pivotally supported bylaterally extending ears 13 secured to said uprights. This cut-oil is socon structed and arranged that it will either intercept materialdelivered to it from above, or permit said material to fall freely intothe pan 10, according to the position of said cut-bit. By preferencesaid cut-oft is what I term an accumulating cut-off, that is to say,when in that position in which it intercepts the material fed to themachine, it also serves as a receptacle for holding and accumulatingsuch material as long as it remains in the position referred to. Mypreferred form of accumulating cut-off has substantially the shape of ahollow cylinder with closed ends and with a considerable portion of itsperiphery cut away on one side, so that that portion of the cylinderwhich is not cut away forms in effect a receptacle with a curved bottom1st and an open top.

Inasmuch as the cut-off 12 and the pan 10 are both carried by and movedwith the scale beam and the uprights S,'said cut-off and pan may bepositively connected without interfering with their upand-downmovements, and therefore I am able to provide these parts with simpleand positive connections so constructed and arranged that whenever thepan 1O tilts into its load-dis charging position, it partially rotatesthe cut-off 12 and brings it into position to receive and hold thematerial delivered to the apparatus while the pan is discharging itscontents, and when said pan, after so discharging its contents, returnsto its load-receiving position, it thereby restores the cutoff to itsoriginal position, which is such th the material received andaccumulated by the cut-off, while the pan 10 is discharging a load, isdumped into the empty pan as soon as the latter has returned into itsloadreceiving position. lVhile the cut-01f is in this position, thestream of material which is supplied to the apparatus is not interceptedby said cut-off but flows directly into the pan 10. My preferredmechanism for accomplishing the results just described con sists of anarm 15 rigidly secured to the axis of the scale pan 10 at one endthereof. an arm 16 rigidly secured to the corresponding end of the axisof the cut-off 12, and a link 17 connecting the free ends of said arms,said link and arms being proportioned and formed substantially as shownin Fig. 5, so that the first portion of the tilting movement of the pan10, when it is about to discharge a load, gives the cut-oil 12 a quickrotation and thus causes it to intercept the stream of material beforeany substantial part thereof has been added to the load just weighed,while during the latter portion of the discharging movement of the panthe free ends of the arms 15 and 16 are brought substantially into linewith each other and with the center on which said pan turns, in whichposition the tilting movements of the pan have little eifect on thecut-off. Coir versely, when the pan 10 returns to its leadreceivingposition, the cut-off remains practically stationary during the firstpart of the movement of said pan, but when the latter has reached aposition in which it will. receive and retain material, the cut-off isquickly rotated and removed from the path of the stream of material.

The material to be operated upon may be delivered to the apparatus inany desired manner, the means shown in the drawings being abelt-conveyor com aosed of an endless belt 18 passing around a roller 19ournaled at the top of the apparatus, and serving to bring material tothe apparatus from any convenient point in a well known manner. As thismaterial leaves the belt as the latter passes around the roller 19, itfalls into the accumulating cut-off 12 or into the scale pan 10,according to the position of the parts, a. fixed deflecting guide 20being employed, if necessary, for properly directing the fallingmaterial.

Inasmuch as the scale pan and cut-off are positively connected in suchmanner that they necessarily move in unison, I am able to control theentire operation of the apparatus bymeans of a single latch mechanism,which is so constructed and arranged that when the scale pan is in theload-receiving position, it locked by said latch and prevented fromtilting until a load has been completed in it, whereupon, by the poisingof. the scale beam, said latch is instantly operated and the scale panis released and 'iermitted to discharge its contents. After a. load hasthus been discharged and the scale pan has returned to theload-receiving position, it is again automatically locked therein bysaid latch. In order to make the sensitiveness of any apparatus as greatas possible, I have devised a novel form of latch for the purpose abovedescribed, which offers no appreciable resistance to the poising of. thescale beam and is released by a very slight movement thereof. This latchis shown at the left hand end of Fig. 1 and is illustrated in detail inFig. 7. Referring to these figures and to Fig. 4-, 21

represents an arm pivoted at one end to the adjacent upright 8 andprovided with a cam slot 22 through which passes a pin 23 rigidlysecured to one end of the scale pan 10. The slot 22 is of such shapethat when the scale pan is in the load-receiving position, any movementthereof toward the load discharging position will tend to swing the arm21 into the position shown in dotted lines in Fig. i, and hence if saidarm be pre' vented from thus moving, the scale pan will thereby be heldin its loadreceiving posi tion until said arm is released. That portionof the slot 22 into which the pin 23 moves after the arm 21 has beenswung laterally by the tilting of the scale pan may be so shaped, shown,that it will be con centric with the axis on which the scale pan turns,so that no lateral movement of said arm will occur during the lastportions of the movement of the scale pan as it tilts into theload-discharging position. Near the path. of the free end of the arm 21is located a strip 24;, which is rigidly secured to the correspondingupright 8 and is proided with a shoulder 25 adapted to engage said freeend and act as a stop for the same when the scale pan is in theload-receiving position. T he strip 24 is preferably made long enough toact as a lateral guide for the arm 21, as best shown in Fig. 4, and saidarm is made sufliciently elastic to cause it to press lightly againstsaid strip 2%, so that when moved into the position shown in full linesin Fig. 4:, it will automatically spring behind said shoulder 25. Asshown in Fig. 1 the arm 21 is preferably pivoted on a long bearing 26,in order to prevent lateral play of said arm. For releasing the free endof the arm 21 from the shoulder and thus permitting the pan 10 todischarge a load, I provide a small triangular plate 27, which islocated within a slot cut in the proper upright 8 and is pivoted theretoat one of its lower corners, in such manner that its upper corner isadapted to bear against the free end of the arm 21 when latched, shownin Fig. 7. To the other corner of said plate is pivotally se cured a rod28, the upper end of which is rigidly secured to the frameworkof themachine, being preferably made adjustable with respect to the same bybeing passed through a stud 2t) and clamped in any desired position bymeans of a set screw 30. These parts so adjusted that when the apparatusis in the load-receiving position, the upper corner of the plate 27 usttouches the free end of the arm 21, this being the position shown inFig. 7. As thus constructed, when a load is completed in the scale panand the latter descends, the plate 27 moves downward with the upright 8which carries it, and as one corner of said plate is held againstdownward movement by the rod 28, the plate necessarily turns on itspivot and by pressing against the free end of the arm 21 disengages thesame from the shoulder thus releasing the scale pan and permitting thesame to tilt and discharge its load. After such discharge the scale beamimmediately rises, carrying the uprights 8 with it and thus restoringthe plate 27 to the position shown in Fig. 7, so that when the pan 10returns to its load-receiving position the free end of the arm 21 willengage the shoulder 25, thus latching the parts in readiness for anotheroperation.

In connection with the improvements above described, I have devisednovelmeans for suspending the scale beam and pan, whereby I am able todispense with the knife edges commonly employed and thus to get rid of aconsiderable amount of trouble which the employment of such knife edgeshas heretofore occasioned. My novel scale beam suspension consists oflinks 31, 31, each pivoted at its upper end to the framework of theapparatus, as at 32, and provided at its lower end with a cross pin orbar 33 forming a horizontal bearing surface. To each of the end nieces 44 of the scale beam is rigidly secured a laterally-extending stud 3%having a cylindrical portion 35 which rests and is adapted to roll uponthe cross pin 33, and the free end of said stud is preferably tapered toa point and inserted between the vertical edges of two plates 36, 36,secured to the corresponding support 2, a slight amount of play beingpermitted between said edges ancL the tapered end of said stud. As thusconstructed, the scale beam is incapable of any lateral movementexcepting the minute movements permitted by the play between the edgesof the plates 36 and the studs 34. It is, however, free to tilt, inwhich case the studs 34; roll on the cross pins 33, and inasmuch as saidstuds are incapable of lateral movement, such rolling action necessarilycauses the cross pins 33, together with the lower ends of the links 31,to move laterally under said studs. The result of this construction isthat I get the effect of a roller bearing in which the roller has arelatively large radius, said radius being equal to the distance betweenthe pivots 32 and the cross pin 33, since said pivots are the centersaround which the turning movement occurs. Thus the effect is the same asit would be if the studs were supported on the rim of a. wheel havingsaid radius. In order to prevent accidental disengage ment of the stu ls34; and the cross pins 33, I prefer to fo the lower end of each link 31in the shapeof an inverted U, the ends of which limit the possiblelateral move ments of said link, and I also prefer to make thecylindrical portion of each stud 34 of less diameter than its outer end,thereby providing shoulders 37 which limit the relative endwisemovements of said stud and its link.

For supporting the uprights 8 upon the ends of the scale beam, I havedevised a rolling bearing which gives me substantially the samelong-radius effect as the bearing above described. In this case I pivotto each upright 8 the upper end of a link 38, as shown at 39, the lowerend of which link rests upon a pin 5L0 secured to the corresponding endpiece of the scale beam and passing loosely through a perforation in theupright 8, so that as the pin ftt) turns with respect to said upright 8,the lower end of said link rolls along the top surface of said pin,while its upper end turns on the pivot 89 as a center. Lateraldisplacement of the lower end of said link is prevented by means such asa stud 41 passing through a somewhat larger perforation 42 formedtherein and secured to the upright 8. The lateral displacement of saidbearing with respect to the end of the s -ale beam which supports it isprevented by means such as a plate 43 secured to the upright 8 andprojecting over the pointed end of the pin 40. It will be understoodthat this construction is duplicated at each end of the apparatus.

The scale pan 10 and the cut-off 12 may also be mounted on rollerbearings, but as extreme delicacy of movement is not required in thesecases, I have shown such bearings as composed of small disks 4L4centrally pivoted to the ears 11 and 13, the ends of the axes of saidpan and cut-off being passed through openings 45 formed in said ears,and supported on the upper edges of these disks, shown in Fig. 6.Endwise movement of said axes may be prevented by means of plates L6similar in structure and function to the plates 43 above described, andI also prefer to locate a small deflectingplate 4-7 above each end ofsaid axes, which plates extend almost to the tops of the respective axesand serve to prevent loose particles of material from falling on thesameand getting into and clogging the bearing surfaces. Similar plates 48,one of which is shown in Fig. 7, serve to prevent loose particles ofmaterial from coming in contact with the links 38 and connecting parts.

As thus constructed, the operation of my apparatus will be apparentwithout further description. The material is fed thereto continuously bymeans of the conveyer belt 18 or otherwise, and when the parts are inthe posit-ion shown in Fig. 2 said material falls past the cut-off anddirectly into the scale pan, until a full load has been made up therein.The scale beam thereupon poises and thus causes the plate 27 to operate,whereby the scale pan is released and permitted to discharge itscontents. The initial tilting movement of the scale pan actuates thecut-off and brings it into the position sition of the scale pan only.

shown in Fig. 3, in which position it receives all the materialdelivered to the apparatus while the scale pan is discharging, and thusaccumulates a partial load for the same, and this function is evidentlyperformed regardless of the position of the scale beam, being dependentupon the po- After said scale pan has discharged its load, it returns tothe load-receiving position, this movement being aided by a weight 49 ifnecessary or desirable, and during the latter part of such movementgives a partial rotation to the cut-off and thus restores it to theposition shown in Fig. 2, whereupon the partial load previouslyaccumulated therein is discharged into the scale pan, and the operationis repeated.

It will be observed that in the construction illustrated the axis onwhich the cut-off turns does not coincide with the axis of thecylindrical portion of said cut-off itself, but is located somewhat toone side of the latter axis. This construction is adopted in order togive the curved bottom of said cut-off a sufficient lateral movement tocarry it wholly beyond the path of the falling stream of material, whenthe parts are in the position shown in Fig. 2, without making itnecessary to employ a cut-off of excessive and otherwise unnecessarydiameter. It will be seen upon reference to Fig. 3 that by this means Iobtain the same result as would be obtained by a cylindrical cut-offhaving its radius equal to the distance between the axis on which mycut-off turns and the inner edge of its curved bottom portion 1%. It isalso to be noted that the stream-controller is operated to cut off theflow of material to the receptacle 10 by the dumping of said receptacle,as distinguished from the descent thereof. This arrangement provides,without the use of springs and tri p-devices therefor, a greater andmore quickly acting force for this operation than can be obtained fromthe descent of a filled receptacle, because the latter is practicallycounterbalanced and hence moves slowly and with little force.

Although I have herein described my improvements as embodied in amachine especially intended to weigh light, bulky materials, yet it willbe evident that said improvements are not limited to such use but areserviceable for weighing a great variety of materials.

So far as I am aware, I am the first to provide an automatic weighingapparatus adapted to receive a continuous stream of material and havingan accumulating cut-off for said stream which is mounted upon and moveswith the scale beam and is operated by positive connections with theload receiver, and hence I consider that the specific construction andarrangement herein shown may be widely varied without departing fromthis portion of my invention.

1 claim as my invention:

1. In an automatic weighing machine, the combination with a scale beamand a load receiver carried thereby, and means for supplying materialthereto continuously, of a stream-controller forming also anaccumulating receptacle, said stream-controller be ing supported by andmovable with the scale beam, and means for actuating saidstreamcontroller.

2. In an automatic weighing machine, the combination with a scale beamand a load receiver carried thereby, and means for supplying materialthereto continuously, of a streaiii-controller forming also anaccumulating receptacle, said stream-controller being supported by andmovable with the scale beam, and connections between said load re ceiverand stream-controller for actuating the latter.

In an automatic weighing machine, the combination with a scale. beam anda load receiver carried thereby, and means for supplying materialthereto continuously, of a stream-controller forming also anaccumulating receptacle, said stream-controller being supported by andmovable with the scale beam, connections between said load receiver andsteam-controller for actuating the latter, and a latch controlling thedischarge of said load. receiver.

4-. In an automatic weighing machine, the combination with a, scale beamand a load receiver carried thereby, and means for supplying materialthereto continuously, of a stream-controller forming also anaccumulating receptacle, said stream-controller being supported by andmovable with said scale beam, and means for shifting saidstream-controller from its discharging to its accumulating position uponthe discharge of said load receiver, and for dumping its accumulatedcontents into the load receiver upon the restoration of the latter toits normal position.

5. In an automatic weighing machine, the combination of a scale beam, ascale pan carried thereby, a cut-off also carried by said beam,connections between said scale pan and cut-off whereby the tiltingmovement of the former operates the latter, a latch controlling thedumping of said scale pan, and means for releasing said latch upon thepoising of the scale beam.

6. In an automatic weighing machine, the combination of a scale beam, adumping scale pan carried thereby, an accumulating cut-off also carriedby said beam, means for supplying material thereto continuously,connections between said scale pan and cutoff for operating the latter,and means controlling the dumping of the scale pan.

combination ofa scale beam, a frame supported thereby, a scale panjournaled in said frame, a cut-olf journaled in said frame above thescale pan, and connections between said scale pan and cut-off comprisingarms 15 and 16 and a connecting link 17.

8. In an automatic weighing machine, the combination of a scale beam, aframe supported thereon, a scale pan ournaled in said frame on an axislocated below and to one side of the center of gravity of said pan and acontained load, a cut-off supported by said frame above the scale pan,connections between said scale pan and. cut-off for operating thelatter, and a latch controlling the dumping of said scale pan. v

9. In an automatic weighing machine, the combination with a scale beamand a load receiver carried thereby, of a stream-controller also carriedby and movable with said scale beam, and composed of an eccentricallymounted cylinder having a portion of its periphery cut away, andconnections between said load receiver and stream-controller whereby thelatter is actuated by the dumping of the former. I

10. In an automatic weighing machine, the combination with a scale beamand a load receiver carried thereby, of means controlling the dischargeof said load receiver,

comprising a latch arm 21, connections between the same and the loadreceiver, a stop shoulder 25, fixed relatively to the load receiver, andmeans for releasing said arm from said stop shoulder upon the descent ofthe load receiver.

11. In an automatic weighing machine, the combination with a scale beamand a load receiver carried thereby, of means controlling the dischargeof said lead receiver, comprising a latch arm 21, connectlons betweenthe same and the load receiver, a stop shoulder 25, a pivoted plate 27movable wlth said arm and normally bearing against the same, and a fixedconnection between said plate and the frame of the machine.

12. In an automatic weighing machine, the combination of a scale beam, aframe carried thereby, a scale pan journaled in said frame and arrangedto be tilted by its weight and that of a contained load, astreamcontroller carried by said frame above said scale pan, connectionsbetween the scale pan and stream-controller whereby the dumping movementof the former operates the latter, and a latch controlling the dumpingof the scale pan and comprising a latch arm 21fpivoted to said frame andprovided with a cam slot, a pin carried by the scale pan and journaledin said slot, a stop shoulder for said arm, and means for releasing saidarm from said stop shoulder upon the descent of the scale beam.

13. In an automatic weighing machine,

7. In an automatic weighing machine, the the combination of a scalebeam, a load receiver carried thereby, means for controlling thedeliveryof material to said load receiver, and means for supporting saidscale beam comprising pivotally suspended links provided with horizontalbearing surfaces, cylindrical bearing studs carried by the scale beamand supported on said bearing surfaces, and means for preventing lateralmovement of said studs.

14. In an automatic weighing machine, the combination of a scale beam, aload receiver carried thereby, means for controlling the delivery ofmaterial to said lead receiver, and means for suspending said scale beamcomprising pivotally-suspcnded links each having its lower end shapedlike an inverted U and. provided with a cross-pin, cylindrical bearingstuds carried by the scale beam and supported on said cross-pinsrespectively, and means forpreventing lateral movement of said studs.

15. In an automatic weighing machine, the combination of a scale beam, aload receiver carried thereby, means for controlling the delivery ofmaterial to ,said load receiver, and means for suspending said scalebeam comprising links 31 pivotally suspended at their upper ends andhaving their lower ends each shaped like an inverted U and provided witha cross-pin, fixed studs secured to the scale beam and having pointedfree ends, and also having cylindrical bearing surfaces of reduceddiameter to rest upon said cross-pins, and plates 36 having adjacentedges between which the ends of said studs are located.

16. In an automatic veighing machine, the combination with a scale beam,of a frame supported thereon and carrying weighing mechanism, linksCOIll'lOCtiDg said frame with the frame work of the machine, and meansfor supporting said frame on said scale beam comprising arms 38 pivotedto said frame, means for limiting the pivotal movements of said arms,and studs 40 carried by the scale beam and supporting the lower ends ofsaid arms 38 respectively, substantially as described.

17. In an automatic weighing machine, the combination of a scale beamand roller disks carried thereby, a tilting receptacle provided withhorizontally-extending pins supported on the upper edges of said disks,means for preventing lateral movement of said pins, and means forcontrolling the delivery of material to said receptacle.

18. In an automatic weighing machine, thecon'ibination of a scale beam,a supporting frame carried thereby and provided withvertically-extending slots, a roller disk carried by said frame beloweach of said slots and extending above the bottom there of, a tiltingreceptacle provided with horizontally-exte'nding pins supported on saidroller disks and entering said slots respectively, and means forcontrolling the delivcry of material to said receptacle.

19. In an automatic weighing machine, the combination of a scale beam,asupporting frame carried thereby and provided ith slots and with rollerdisks 4 1 located below said slots respectively, a tilting receptacleprovided with horizontal]y-extending pins supported on said disks andpassing through said slots, plates for n'eventing endwise movement ofsaid pins, and means for controlling the delivery of material to saidreceptacle.

In testimony whereof, I have hereunto subscribed my name this fourteenthday of February, 1903.

VILLIAM E. NICKERSON.

Witnesses E. D. Crmnwicn, Josnrn T. BEEN NM.

